Lever-jack.



J. DILLoN. LEVER JACK. APPLIUATION FILED FEB. 17, 198.

907,226. Patented Dec. 22, 1908.

. 2 SHEETS-SHEET 1.

MMI:

J. DILLON.

LEVER JACK.

APPpIoATIoH FILED rms. 17, 190s.

Patented Dec. 22, 1908.

2l SHEETS-SHEET 2.

JOHN DILLON., 9F EoUsTON, ITEXMS1 i 'ILEvaria-.Lacie,f1y t i f specificati@ oi-Leaef recent. r y meenten nec. ae, ieeea Application mearebmag r1, 196s. v sain No. 413,244.

To all whom 'it may concern:

Be it known that I, JOHN zen of the United States, andresident of Houston, in the county of Harris and 'State of Texas, have invented certain new and useful Improvements in Lever-Jacks; and I l do hereby declarel that the followingisfa, full, clear, and exact descriptionthereof.`

The invention relates to a species `of leverjacks each comprising a lever, a pair of pawls in connection with the lever, a rackedge slide-bar with which the pawls cooperate, a yielding spring-controlled pawltripper, and means for adjusting the tripper with reference to determining the direction of movement of said `bar when said lever is actuated; the ob'ect of said invention being to provide simp e, economical and eicient implements of the species aforesaid, which ob]ect is attained by the general construetion, arrangement and coperation of' parts in the improved jacks, one of the same beinfg hereinafter particularly set forthwith-ire erence to the accompanying drawings, espef cialattention being called to its pawltripper reciprocative in -the plane of the power applied thereto byv the pawls, to thus obviate binding of said tripper and to insure the full eliciency of its controllingspring with respect to retracting said pawls from the rack-edge of the slide-bar at proper times. Attention is also called to a shiftingcam `of the implement mounted `in connection with/ the pawl-tripper.

Figure 1 of the drawin s representsa side elevation of an improvedglever-jack having the frame or stand thereof partly broken away, a detachable plate portion of the same being removed; Fig. 2, a side elevationvvof a fragment of the 3ack; Fig. 3, a diagram illustrating movement of Various partsfin said jack when the pawl-tripper of same is adjusted to provide for step-by-step reverse travel of the slide-bar incidental tol operations of the lever, and Fig. 4, a vertical section view of a fragment of the jacln'this view being indicated by lines 44 in Fig. L

l Referring by letter to the drawings, A indicates the jack-frame or stand, the same being of any suitable design',\B the slidebar of the jack, b a stop-screw engaging a 4 side groove in said bar, C the jacklever fulcrumed in said frame, D, E, the pawls in connection ywith said lever to engage a rack-edge of said bar, and c, d, vsuitably arranged springs by which the proper en- DILLoN, al citi- 1 y gagement ofsaid pawls with the aforesaid bar is insured; the general construction .and arrangement of the parts thus farV described being common `in the art and susceptible te various changes in matters of detail from what is herein shown. y

At one end, the jack-frame is provided with la chamber c containing a spirailsprin F surrounding a cylindrical shanleend e the longitudinall reciprocative perni-tripn per element Gr o i the jaclnthis shank bein ided in an aperture in a partition j divi ingsaid chamber from the main chamber of saidY frame. The sprin F is confined between the partition f an a washer g held on the shank-end of the 'tripper by a set-screw L, and an annular shoulder i of the tripper r`opposes the partition, f within the main `chamberofthe jack-frame. The other end ofthetripper is in the form of a hook hav ing aupreferably inclined terminal j that is at ytimes in the path of a lateral lug il@ of the pawl D, and an inclined shoulder m of said tripper'is at times in the path of a lateral lug n ofthe pawl E, said pawls, the fulfcrum p for thelever C and the pawl-controlling springs' being with the maj or portion of tlre aforesaid tripper in the main chamber of the jack-frame. It is preferable, as herein shown, to have the hook-end of the tripper in sliding contact with the flange of the guide-way for the slide-arm of the jacli.

To facilitate access to the aforesaid cham- ,bers of the jack-frame, these chambers are l.with `winger to facilitate its adjustment.

. When the cam I yis in the position shown theinclines j, m, thereof in the paths of the lugs 7c, n, of the pawls D, FJ, the jack being then operative for a step-by-step reeedence ,in Fig. 2, the tripper Gr is adjusted to have of its-slide-bar, incidental to oscillation of `its lever.

ically engage with one of the teeth of said bar and the load will be quickly distributed on both of said pawls. During the recedence of the pawl D, its lug c will make contact with the incline 7' of the tripper G, whereby this tripper is moved in the direction to store power in the spring F with which it is engaged. A continued upward movement of the jack-lever C will slightly raise the bar B, by means of the pawl E releasing the loadv from the pawl D, and the power previously stored in the spring F will then operate, through the inclines of the tripper G, against the lug Ic on the pawl D to remove this pawl from contact with said bar. Now when the jack-lever C is moved downward, the bar B is caused to recede, at the same time raising the pawl D, and the lug n of the pawl E coming into contact with the inclined lug m of the tripper G, the latter is again moved in the direction necessary to store power in its springF during continued downward movement of said lever.' The pawl D being free of4 the tripper, it automatically engages with the teeth of the bar B, and during the downward movement of the jack-lever, said pawl is caused to slightly raise said bar, thus relieving the load from the paWl E, the result being that the power stored in the spring F actuates said tripper to remove said pawl E from contact with the aforesaid bar. A continuance of the operations described will result in a lowering of the bar B step-bystep, the distance ot one half a notch of its rack-edge being accomplished at each stroke of the jack-lever.

The pawl-tripper being reciprocative in the plane of the power applied thereto by the pawls to intermittently move it in one direction against resistance of its controlling spring, there is no liability of said tripper to bind in or on its guides, and the etliciency of its controlling spring is not in the least impaired. y

When step-by-step outward movement of the slide -bar is desirable, as a result of -manipulation of the jack-lever, the cam I is turned on its pivot to have its greatest radius in line with the opposing stationary lug u,

and thus the pawl-tripper is adjusted toV move the same inward out of the paths of the opposing lugs of the pawls, said pivot being in connection with said tripper and slidable in the longitudinal slot t of the detachable plate H of the jack-trame. This adjustment of the tripper having been effected, the pawls are both in engagement with the rack-edge of the slide-bar and operate alternately to effect the step-by-step outward movement of said bar, incidental to oscillation of the jack-lever.

I claim:

l. In a jack, the combination of a frame, a rack-edge slide-bar guided in the frame, a lever having its fulcrum in vsaid frame, a

pair of pawls carried by the lever to be engageable with said edge of the slide-bar, a spring-controlled longitudinally reciprocative pawl-tripper guided in the aforesaid frame, and lugs extending laterally from the pawls in pbsition to intermittently actuate the tripper'for a time against resistance of its spring, the reciprocation of said tripper being in the plane of the power applied thereto by said pawls.

2. In a jack, the combination of a frame, a rack-edge slide-bar guided in the frame, a lever having its' fulcrum in said frame, a pair of .pawls carried by the lever to be engageable with said edge of the slide-bar, a spring-controlled longitudinally reciprocative pawl-tripper guided in the aforesaid frame, means for holding the saine out of working position, and lugs extending laterally from the pawls to intermittently actuate the tripper for a time against resistance of its spring when said tripper is in working position, the reciprocation of this tripper being in the plane of the power applied thereto by said pawls.

3. In a jack, the combination of a frame, a rack-edge slide-bar guided in the frame, a

lever having its ulcrum in said frame, a" pair of pawls carried by the lever to be en`-` gageable with said edge of the slide-bar, a; guide, a tripper having a shank-end engaging the guide, an inclined shoulder and a hook-end; a tripper-supporting spring opposing said guide, and lugs extending laterally from the pawls to have intermittent alternate moving contact for a time with the hook-terminal and shoulder of the tripper against resistance of the spring, said tripper being reciprocative in the plane of the power applied thereto by said pawls.

4;. In a jack, the combination of a iframe, a rack-edge slide-bar guided in the frame, a lever having its fulcrum in said frame, a pair of pawls carried by the lever to be en.-

gageable with said edge of the slide-bar, a

spring-controlled yielding pawl-tripper, a cam on a pivot in connection with the tripper and opposite a stationary portion of the aforesaid frame to shift said tripper in and out of working position; and lugs extending laterally from the pawls to intermittently actuate the tripper for a time against resistance of said spring when this tripper is in working position to have reciprocation in the plane of the power applied thereto by said-pawls.

5. In a jack, the combination of a frame, a' rack-edge slide-bar guided in the frame, a lever having its ulcrum in said frame, a pair of pawls carried by the lever to be engageable'with said edge of the slide-bai', a guide, a tripper having a shank-end engaging the guide, an inclined shoulder and a hook-end;l a tripper-supporting spring opposing said guide, lugs extending laterally from the pawls to have intermittent altershift the tripper in and out of working posinate moving contact for a time with the tion.

hook-terminal and shoulder of the tripper In testimony that I claim the foregoing I against resistance of its sprin when said have hereunto set niy hand at Houston in 5 tripper is in working osition, 1t being then the county of Harris and State of Texas in 15 reciprocative in the p ane of the power ape 4the presence of two Witnesses.

plied thereto by the pawls; and a cam on a J N O. DILLON. pivot in connection with the aforesaid trip- Witnesses: per and opposite a stationary portion of the R.4 M. DAVIS,

10 aforesaid frame, said cam being operative to C. SCHALLOCK. 

